use-smart-contract-platform
Overview
Circle Smart Contract Platform (SCP) provides APIs and SDKs for deploying, importing, interacting with, and monitoring smart contracts across supported networks. Deploy contracts from raw bytecode, use audited templates for standard patterns, execute ABI-based contract calls, and monitor emitted events through webhooks.
Prerequisites / Setup
Installation
npm install @circle-fin/smart-contract-platform @circle-fin/developer-controlled-wallets
Environment Variables
CIRCLE_API_KEY= # Circle API key (format: PREFIX:ID:SECRET)
ENTITY_SECRET= # Registered entity secret for Developer-Controlled Wallets
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USDC is Circle's stablecoin deployed across multiple blockchain ecosystems including EVM chains (Ethereum, Base, Arbitrum, Polygon, Arc) and Solana. Use this skill to check balances, send transfers, approve spending, and verify transactions. Triggers on: USDC balance, send USDC, transfer USDC, approve USDC, USDC allowance, verify USDC transfer, USDC contract address, USDC on Solana, Solana USDC, check balance, SPL token, Associated Token Account, ATA, ERC-20 USDC, parseUnits, formatUnits, 6 decimals, viem, @solana/kit.
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Provide instructions on how to build with Arc, Circle's blockchain where USDC is the native gas token. Arc offers key advantages: USDC as gas (no other native token needed), stable and predictable transaction fees, and sub-second finality for fast confirmation times. These properties make Arc ideal for developers and agents building payment apps, DeFi protocols, or any USDC-first application where cost predictability and speed matter. Use skill when Arc or Arc Testnet is mentioned, working with any smart contracts related to Arc, configuring Arc in blockchain projects, bridging USDC to Arc via CCTP, or building USDC-first applications. Triggers: Arc, Arc Testnet, USDC gas, deploy to Arc, Arc chain, stable fees, fast finality.
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Create and manage Circle developer-controlled wallets where the application retains full custody of wallet keys on behalf of end-users. Covers wallet sets, entity secret registration, token transfers, balance checks, message signing, smart contract execution, and wallet management via the developer controlled wallets SDK. Triggers on: developer-controlled wallets, dev-controlled wallets, create wallet, wallet set, entity secret, transfer tokens, check balance, EOA wallet, SCA wallet, initiateDeveloperControlledWalletsClient, createWalletSet, createWallets, custody wallet, sign message, sign transaction, sign typed data, contract execution, execute contract, call contract, wallet upgrade, derive wallet, estimate fee, accelerate transaction, cancel transaction.
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Build USDC bridging with Circle App Kit or standalone Bridge Kit SDK and Crosschain Transfer Protocol (CCTP). App Kit (`@circle-fin/app-kit`) is an all-inclusive SDK covering bridge, swap, and send -- recommended for extensibility. Bridge Kit (`@circle-fin/bridge-kit`) is a standalone package for bridge-only use cases. Neither requires a kit key for bridge operations. Supports bridging USDC between EVM chains, between EVM chains and Solana, and between any two chains on Circle Wallets (i.e Developer-Controlled Wallets or Programmable wallets). Use when: bridge USDC, setting up Bridge Kit adapters (Viem, Ethers, Solana Kit, Circle Wallets), handling bridge events, collecting custom fees, configuring transfer speed, or using the Forwarding Service. Triggers on: Bridge Kit, App Kit, bridge USDC, crosschain transfer, CCTP, move USDC between chains, @circle-fin/bridge-kit, @circle-fin/app-kit, adapter-viem, adapter-ethers, adapter-solana-kit, forwarding service, bridge routes.
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